Bioinfo Publications 119 LUMINESCENCE CHARACTERIZATION OF Tb3+ AND Eu3+ ACTIVATED NA2SR2MG(BO3)2F2

Abstract- Tb3+ and Eu3+ activated Na2Sr2Mg(BO3)2F2 phosphors were prepared by wet chemical route and characterized by photolumines-cence and thermoluminescence techniques. The PL emission spectra exhibit four main peaks with the maxima at about 490, 545 (the high-est one), 587, and 626 nm. PL emission spectra of Eu doped Na2Sr2Mg(BO3)2F2 phosphor shows two well resolved peaks around 593nm and 618nm which are assigned to 5D0→7F1 and 5D0→7F2 transition of Eu3+ ion and a peak around 425nm due to 4f65d1→4f7 transition of Eu2+ in the blue region of visible spectrum. Thermoluminescence glow curves of Na2Sr2Mg(BO3)2F2 phosphor doped with Eu3+ and Tb3+ ions exposed to 7Gy gamma irradiation dose of 60Co are illustrated. Glow peak is observed at 221ºC for Eu3+ doped host and TL intensity is about 2 times less than standard CaSO4:Dy TLD phosphor